Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

S. Chatrchyan M. Anfreville 1 M. Besancon 1 S. Choudhury 1 M. Dejardin 1 D. Denegri 1 B. Fabbro 1 J.L. Faure 1 F. Ferri 1 S. Ganjour 1 F.X. Gentit 1 A. Givernaud 1 P. Gras 1 G. Hamel De Monchenault 1 P. Jarry 1 F. Kircher 1 M.C. Lemaire 1 E. Locci 1 J. Malcles 1 I. Mandjavidze 1 A. Nayak 1 J.P. Pansart 1 J. Rander 1 J.M. Reymond 1 A. Rosowsky 1 I. Shreyber 1 M. Titov 1 P. Verrecchia 1 J. Badier 2 S. Baffioni 2 F. Beaudette 2 E. Becheva 2 L. Benhabib 2 L. Bianchini 2 M. Bluj 2 C. Broutin 2 Pierre Busson 2 M. Cerutti 2 D. Chamont 2 C. Charlot 2 N. Daci 2 T. Dahms 2 M. Dalchenko 2 L. Dobrzynski 2 A. Florent 2 Y. Geerebaert 2 R. Granier De Cassagnac 2 M. Haguenauer 2 P. Hennion 2 G. Milleret 2 P. Mine 2 C. Mironov 2 I.N. Naranjo 2 M. Nguyen 2 C. Ochando 2 P. Paganini 2 T. Romanteau 2 D. Sabes 2 R. Salerno 2 A. Sartirana 2 Y. Sirois 2 C. Thiebaux 2 C. Veelken 2 A. Zabi 2 J.-L. Agram 3 J. Andrea 3 A. Besson 3 D. Bloch 3 D. Bodin 3 J.-M. Brom 3 M. Cardaci 3 E.C. Chabert 3 C. Collard 3 E. Conte 3 F. Drouhin 3 C. Ferro 3 J.-C. Fontaine 3 D. Gele 3 U. Goerlach 3 C. Goetzmann 3 L. Gross 3 D. Huss 3 P. Juillot 3 E. Kieffer 3 A.-C. Le Bihan 3 J. Pansanel 3 Y. Patois 3 P. Van Hove 3 D. Boutigny 4 D. Mercier 4 G. Baulieu 5 S. Beauceron 5 N. Beaupere 5 M. Bedjidian 5 O. Bondu 5 G. Boudoul 5 S. Brochet 5 J. Chasserat 5 R. Chierici 5 C. Combaret 5 D. Contardo 5 P. Depasse 5 H. El Mamouni 5 J. Fay 5 S. Gascon 5 N. Giraud 5 M. Gouzevitch 5 R. Haroutunian 5 B. Ille 5 T. Kurca 5 M. Lethuillier 5 N. Lumb 5 H. Mathez 5 L. Mirabito 5 S. Perries 5 L. Sgandurra 5 V. Sordini 5 Y. Tschudi 5 M. Vander Donckt 5 P. Verdier 5 S. Viret 5
Abstract : Results are presented from searches for the standard model Higgs boson in proton-proton collisions at sqrt(s)=7 and 8 TeV in the CMS experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at 7 TeV and 5.3 inverse femtobarns at 8 TeV. The search is performed in five decay modes: gamma gamma, ZZ, WW, tau tau, and b b-bar. An excess of events is observed above the expected background, a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, gamma gamma and ZZ; a fit to these signals gives a mass of 125.3 +/- 0.4 (stat.) +/- 0.5 (syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one.
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Journal articles
Physics Letters B, Elsevier, 2012, 716, pp.30-61. <10.1016/j.physletb.2012.08.021>


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Submitted on : Wednesday, August 1, 2012 - 7:00:17 AM
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S. Chatrchyan, M. Anfreville, M. Besancon, S. Choudhury, M. Dejardin, et al.. Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC. Physics Letters B, Elsevier, 2012, 716, pp.30-61. <10.1016/j.physletb.2012.08.021>. <in2p3-00722244>

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